# File lib/nokogiri/xml/node.rb, line 498
      def serialize *args, &block
        if args.first && !args.first.is_a?(Hash)
          $stderr.puts("\#{self.class}#serialize(encoding, save_opts) is deprecated and will be removed in\nNokogiri version 1.4.0 *or* after June 1 2009.\nYou called serialize from here:\n\n\#{caller.first}\n\nPlease change to \#{self.class}#serialize(:encoding => enc, :save_with => opts)\n")
        end

        options = args.first.is_a?(Hash) ? args.shift : {
          :encoding   => args[0],
          :save_with  => args[1] || SaveOptions::FORMAT
        }

        io = StringIO.new
        write_to io, options, &block
        io.rewind
        io.read
      end